optOrEnvVar.RdoptOrEnvVar retrieves that value assocaited with the
name provided as an argument, prioritizing in its search
by first interpreting the given argument as an R
option name, and then trying an interpretation as an
environment variable if and only if the R option
is not set or is an empty string or vector.
optOrEnvVar(name)
| name | The name of the option or env var to fetch |
|---|
The value associated with the given name,
returning NULL if and only if the name is
set neither as an option nor as environment variable.